[wwwdocs] Add a note about in-class initialization of static data member

Marek Polacek polacek@redhat.com
Thu Feb 11 14:20:00 GMT 2016

Does this look ok?

Index: porting_to.html
RCS file: /cvs/gcc/wwwdocs/htdocs/gcc-6/porting_to.html,v
retrieving revision 1.9
diff -u -r1.9 porting_to.html
--- porting_to.html	10 Feb 2016 17:21:54 -0000	1.9
+++ porting_to.html	11 Feb 2016 14:18:59 -0000
@@ -269,6 +269,25 @@
 to port the code to use C++11's <code>std::unique_ptr</code> instead.
+<h3>'constexpr' needed for in-class initialization of static data member</h3>
+Since C++11, the <code>constexpr</code> keyword is needed when initializing
+a non-integral static data member in a class.  Thus the following program is
+accepted in C++03 (albeit with a <tt>-Wpedantic</tt> warning):
+struct X {
+  const static double i = 10;
+While in C++11, the program above is rejected with an error.  The fix is to
+use <code>constexpr</code> instead of <code>const</code>.
 A new warning <code>-Wmisleading-indentation</code> was added


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